Outline of the Library of Congress classification.
APA Citation
Library of Congress. Subject Cataloging Division., Library of Congress. Classification Division. (1970). Outline of the Library of Congress classification. 2d ed. Washington.
MLA Citation
Library of Congress. Subject Cataloging Division, and Library of Congress. Classification Division. Outline of the Library of Congress Classification. 2d ed. Washington, 1970.
Warning: These citations may not always be complete (especially for serials).